H. H. GRAN AND K. YENDO. M.-N. Kl. 



may be proved by examining fig. 2, which is drawn from a specimen 

 from Otaru Bay. 



Loc..^ Kuriles; Tosa Prov (Okamura), Enoshima; Akashi (Schröder). 

 Bay of Bengal (Gran and Ykndo). 



Sect. 2. Borealia Ostenf. 

 Chaetoceras densum Cleve. 



Cleve: 1906, p. 299. -- GkAxn: 1904, p. 531, fig. 2. — Do.: 



1906, p. 67, fig. 79. — Schröder: 1906, p. 337. — Okamura: 



1907, p. ?>j, PI. 3, figs. 16, 17. — Meunier: 1910, p. 217, 

 PI. XXIV, figs. 15, 16. 



= Chaetoceras boréale var. Brighiwelli Cleve: 1873 a, p. 12, 

 PI. II, fig. 7, b— d. 



== C. boréale var. densum Cleve: 1897 a, p. 20, PI. r, figs. 3, 4. 

 ?rr= C. aequatorialis Yendo: 1905, p. 47, PI. XI, fig. 18 a. 

 The figures given by Okamura, 1. c, seem rather to be referable 

 to C. boréale Bail., though the girdle- bands are much broader than they 

 ought to be with ordinary forms. The plant which Yendo, 1, c, has 

 with some hesitation identified with C. aequatoriale Cleve, has characters 

 more like those of the present species or the next. 



Loc. Boshu Prov. (Okamura). Enoshima; Akashi (Schröder). 

 ?Misaki (Yendo). 



Chaetoceras coarctatum Laud. 



Lauder: 1874, p. 79, fig. 8. — Cleve: 190 i b, p. 54. — 

 Gran: 1906, p. 68, fig. 80. — Schröder: 1906, p. 336. — 

 Okam.: 1907, p. 90, PI. 3, figs. 25 — 32. 



= C. boréale var. rudis Cleve: 1897a, p. 20, t. i, fig. 5. 

 = C. rudis Cleve: 1901, p. 308. 

 Loc. Shirahama; Tosa Prov.; Shima Prov.; (Okamura). Misaki; 

 Echigo Prov. (Yendo). Enoshima; Akashi (Schröder). 



Chaetoceras denticalatum Lauder. 



Lauder: 1864, p. 79, PI. VIII, fig. 9. — Schröder: 1906, 



p. 337, p. 349, fig. 14 a, b. — Okam.: 1907, p. 91, PI. 4, fig. 66. 



= Ch. n.anodenticidatuni Okam.: 1907, p. 91, text fig. a— c. 



Chaetoceras nanodenticulatum Okam. can hardly be regarded 



as distinct from the present species. 



Loc. Enoshima (Schröder). Prov. Shima (Okamura). Hong Kong. 



(Lauder). 



